是否有 Rails 列类型的文档？ - Is there documentation for the Rails column types?

问题：

I'm looking for more than the simple type listing that is found on this page :我正在寻找的不仅仅是此页面上的简单类型列表：

:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean :primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean

But is there any documentation that actually defines these fields?但是是否有任何文档实际定义了这些字段？

Specifically:具体来说：

• What's the difference between :string and :text ? :string和:text什么区别？
• Between :float and :decimal ?在:float和:decimal ？
• What are the distinguishing features of :time , :timestamp , and :datetime ? :time , :timestamp和:datetime的显着特征是什么？

Are the nuances of these types documented anywhere?这些类型的细微差别是否记录在任何地方？

EDIT: Points of DB-platform implementations are irrelevant to the question I'm trying to ask.编辑： DB 平台实现的要点与我要问的问题无关。 If, say, :datetime does not have a defined intended meaning in Rails documentation, then what do db-adapter-writers go by when choosing a corresponding column type?例如，如果:datetime在 Rails 文档中没有定义的预期含义，那么 db-adapter-writers 在选择相应的列类型时会怎么做？

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解决方案：

参考一： https://en.stackoom.com/question/nssq
参考二： https://stackoom.com/question/nssq